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Thread: One for James & the rock structure folks

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    Default One for James & the rock structure folks



    What's the spine called (hit the Google map link to better check it out)? How did it form?

    There's another crossing the road a mile north as well.

    The three images (map marker) are of the same formation.

    https://www.google.com/maps/place/40...4d-106.0719695
           

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    JGRubicon (3 Weeks Ago)

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    Default Re: One for James & the rock structure folks



    I'm in no way a geologist or even an earth science expert. I have spend many years in glaciation but only for personal interest.

    My best guess would be that during the the formation of the Rocky's which some estimate were over 20,000' at one point. As upheavals occurred cracks were formed well underground and those cracks may have filled with magma. Once the Rocky's were eroded to their current state these magma filled cracks were exposed.

    Just guessing mind you, but I do know that lava spines are formed in the same way on the sides of lava domes and are then either trust up out of the ground or the dome erodes away exposing the spine.
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    Default Re: One for James & the rock structure folks



    Those are classic igneous dikes - I believe Radial Mountain would be their source. Most of these type features are found around igneous intrusions much more recent than the Rocky Mts we see, and of course, much more recent than the rocks around them. Dikes are typically fairly mafic (magnesium and iron rich minerals) and typically are somewhat erosion resistant and make pronounced 'wall' or linear features. Some more info - Silver Mt in Huerfano county is probably pretty similar to Radial Mt.
    http://coloradogeologicalsurvey.org/...c-rocks/dikes/
    http://coloradogeologicalsurvey.org/.../radial-dikes/
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